Here is a glance at some of the worst U.S. mass shootings in recent years:

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Nov. 5, 2009: The Army says 13 people were killed and 30 wounded in a shooting rampage at its Fort Hood base in Texas. The suspect in the shootings, Maj. Nidal Malik Hasan, was wounded and is hospitalized.

April 3, 2009: A 41-year-old man opened fire at an immigrant community center in Binghamton, N.Y., killing 11 immigrants and two workers. Jiverly Wong, a Vietnamese immigrant and a former student at the center, killed himself as police rushed to the scene.

March 10, 2009: Michael McLendon, 28, killed 10 people, including his mother, four other relatives and the wife and child of a local sheriff's deputy, across two rural Alabama counties. He then committed suicide.

Feb. 14, 2008: Former student Steven Kazmierczak, 27, opened fire in a lecture hall at Northern Illinois University in DeKalb, fatally shooting five students and wounding 18 others before committing suicide.

Dec. 5, 2007: 19-year-old Robert A. Hawkins opened fire with a rifle in Omaha, Neb., at a Von Maur store in the Westroads Mall, killing eight people before taking his own life. Five more people were wounded, two critically.

April 16, 2007: Cho Seung-Hui, 23, fatally shot 32 people in a dorm and a classroom at Virginia Tech in Blacksburg, then killed himself in the deadliest mass shooting in modern U.S. history.

Feb. 12, 2007: 18-year-old Sulejman Talovic killed five and wounded four at the Trolley Square mall in Salt Lake City, Utah. He was then shot and killed by police.

Oct. 2, 2006: Charles Carl Roberts IV, 32, shot to death five girls at West Nickel Mines Amish School in Pennsylvania, then killed himself.

March 21, 2005: 16-year-old student Jeffrey Weise killed nine people, including his grandfather and his grandfather's companion at home, and then five fellow students, a teacher and a security guard at Red Lake High School in Red Lake, Minnesota, before killing himself. Seven students were wounded.

March 12, 2005: Terry Ratzmann, 44, gunned down members of his congregation as they worshipped at the Brookfield Sheraton in Brookfield, Wisconsin, slaying seven and wounding four before killing himself.

July 29, 1999: Former day trader Mark Barton, 44, killed nine people in shootings at two Atlanta, Georgia, brokerage offices, then committed suicide. Continued...